Adding upstream version 3.45.1.upstream/3.45.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
author: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-04-13 14:07:11 +0000
committer: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-04-13 14:07:11 +0000
commit: 63847496f14c813a5d80efd5b7de0f1294ffe1e3 (patch)
tree: 01c7571c7c762ceee70638549a99834fdd7c411b /www/c3ref/vtab_collation.html
parent: Initial commit. (diff)
download: sqlite3-63847496f14c813a5d80efd5b7de0f1294ffe1e3.tar.xz
sqlite3-63847496f14c813a5d80efd5b7de0f1294ffe1e3.zip
1 files changed, 159 insertions, 0 deletions
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+<!DOCTYPE html>
+<html><head>
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+<link href="../sqlite.css" rel="stylesheet">
+<title>Determine The Collation For a Virtual Table Constraint</title>
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+<!-- keywords: sqlite3_vtab_collation -->
+<div class=nosearch>
+<a href="../c3ref/intro.html"><h2>SQLite C Interface</h2></a>
+<h2>Determine The Collation For a Virtual Table Constraint</h2>
+</div>
+<blockquote><pre>
+const char *sqlite3_vtab_collation(sqlite3_index_info*,int);
+</pre></blockquote>
+<p>
+This function may only be called from within a call to the <a href="../vtab.html#xbestindex">xBestIndex</a>
+method of a <a href="../vtab.html">virtual table</a>.  This function returns a pointer to a string
+that is the name of the appropriate collation sequence to use for text
+comparisons on the constraint identified by its arguments.</p>
+
+<p>The first argument must be the pointer to the <a href="../c3ref/index_info.html">sqlite3_index_info</a> object
+that is the first parameter to the xBestIndex() method. The second argument
+must be an index into the aConstraint[] array belonging to the
+sqlite3_index_info structure passed to xBestIndex.</p>
+
+<p>Important:
+The first parameter must be the same pointer that is passed into the
+xBestMethod() method.  The first parameter may not be a pointer to a
+different <a href="../c3ref/index_info.html">sqlite3_index_info</a> object, even an exact copy.</p>
+
+<p>The return value is computed as follows:</p>
+
+<p><ol>
+<li><p> If the constraint comes from a WHERE clause expression that contains
+a <a href="../lang_expr.html#collateop">COLLATE operator</a>, then the name of the collation specified by
+that COLLATE operator is returned.
+<li><p> If there is no COLLATE operator, but the column that is the subject
+of the constraint specifies an alternative collating sequence via
+a <a href="../lang_createtable.html#collateclause">COLLATE clause</a> on the column definition within the CREATE TABLE
+statement that was passed into <a href="../c3ref/declare_vtab.html">sqlite3_declare_vtab()</a>, then the
+name of that alternative collating sequence is returned.
+<li><p> Otherwise, "BINARY" is returned.
+</ol>
+</p><p>See also lists of
+  <a href="../c3ref/objlist.html">Objects</a>,
+  <a href="../c3ref/constlist.html">Constants</a>, and
+  <a href="../c3ref/funclist.html">Functions</a>.</p>
+
author	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-04-13 14:07:11 +0000
committer	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-04-13 14:07:11 +0000
commit	63847496f14c813a5d80efd5b7de0f1294ffe1e3 (patch)
tree	01c7571c7c762ceee70638549a99834fdd7c411b /www/c3ref/vtab_collation.html
parent	Initial commit. (diff)
download	sqlite3-63847496f14c813a5d80efd5b7de0f1294ffe1e3.tar.xz sqlite3-63847496f14c813a5d80efd5b7de0f1294ffe1e3.zip